Press.



N. C. WALLBNTHIN & E. 0. SMITH.

PRESS.

APPLICATION FILED MAY 6, 1905. 947,360. Patented Jan. 25, 1910.

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J 3% 4M WITNESSES 8 INVENTOHS BY M . 6Q ATTORNEYS N. O. WALLENTHIN & E.G. SMITH;

PRESS.

APPLICATION nun MAY 6, 1905.

Patented Jan. 25, 1910.

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IN VENT 035 WITNESSES fie. m

N. C. WALLENTHIN & B. 0. SMITH. PRESS.

APPLIOATIOH mum Mme, 1905.

947,360. Patented Jan. 25,1910.

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N. G. WALLENTHIN & E. G. SMITH.

PRESS.

APPLICATION FILED MAY 6, 1905.

947,360. Patented Jan. 25, 1910.

5 SHEETS-SHEET 4.

N. 0; WALLENTHIN & E. G. SMITH.

PRESS.

I APPLICATION FILED MAYB, 1905.

Patented Jan. 25, 1910.

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' UNITED STATES PATENT I onFIcE.

NILS C. WALLENTHIN, OF CENTRAL FALLS, AND EDWIN C. SMITH, OF PAWTUCKET,RHODE ISLAND, ASSIGNORS TO THE MOSSBERG WRENCH COMPANY, OF PORTLAND,

MAINE, A CORPORATION OF MAINE.

PRESS.

Specification of Letters Patent.

..atented Jan. 25, 1910.

To all whom it may concern:

Be it known that we, NILS C. WaLnnN- THIN and EDWIN C. SMITH, citizensof the United States, residing at Central Falls and Pawtucket,respectively, in the county of Providence and State of Rhode Island,have invented new and useful Improvements in Presses, of which thefollowing is a specification.

Our invention relates to punching-machines or power-presses, andparticularly to mechanism for controlling their operation.

The object of our invention is to provide means for operating the pressautomatically, feeding the stock continuously to the machine and formingit into prescribed len ths.

6hr improvement is of obvious advantage, providing as it does forgreatly increased production.

Our invent-ion embraces the essential features of a controllingmechanism, operating automatically to cause the action of the punch whenthe stock is fed to its proper position, but preventing such action uponfailure of the stock to be properly fed, and means for ejecting thefinished stock after each operation.

The invention is fully described in the following specification,illustrated by the accompanying drawings, in which:

Figure 1 is a perspective view of the complete machine; Fig. 2, anelevation of the feeding mechanism; Fig. 3, a detail of the feedingmechanism clutch; Fig. 4, a detail of the means for operating thefeeding mechanism manually; Fig. 5, another detail of the same; Fig. 6,a part sectional view of the clutch mechanism of the punching machineand the controlling mechanism therefor; Fig. 7, another view of thesame, being a sec tion on the line X-X, Fig. 6; Fig. 8, a detail of theclutch key lever; Fig. 9, a view of the contact device of thecontrolling mechanism with the electrical connections showndiagrammatically; Fig. 10, a view of the e eCtmg device; Fig. 11 shows amodification of the clutch key lever; Fig. 12

shows a modification wherein the clutch controlling device is arrangedto be operated mechanically; Fig. 13, a part sectional View of the same,taken on line Z- J, Fig. 12.

In Fig. 1 is shown a punching-machine or power-press of the usualdesign, fitted with the devices of our invention. The machine propercomprises the frame A, supporting the die a on its base, and providedwith vertical guideways for the sliding cross-head B, in which latter iscarried the punch b held in position by any suitable arrangement. Thecross-head B is reciprocated from the shaft C by any suitable means as,for instance, a cam or crankmotion not here shown in detail. The shaft(1 is driven by a continuously rotated balance wheel D through a clutchmechanism shown at E, the latter to be more specifically describedhereinafter. The clutch is operated bythe device at F, the latter beingcontrolled by a device at G, operated either electrically ormechanically, by the stock being fed into it. In Fig. 1 we have shownthe electrical contact device in place at Gr, this being the preferablearrangement.

The machine is especially adapted for strip stock, either flat or roundwire for instance, and we prefer to employ a feeding mechanism, shown atH, for securing automatically a continuous supply of material. However,it will be understood that the supply might be effected manually, ifdesired.

The ejecting device whereby the finished pieces are automatically thrownout from the die, to make room for the raw stock, is indicated at I.

.lteferring now to Fig. 2, the feeding mechanism we have preferred touse consists essentially of two rolls 2 and 3 held in resilient contactwith the stock and adapted to be intermittently rotated toward eachother, through suitable means connected with the shaft C of the machine.The lower roll 3 is fixedly mounted on a shaft 4, supported instationary bearings in the frame 71, but the bearings for the shaft 5,on which the roll 2 is fast. are slidable vertically in the frame 1:.These upper bearings are two blocks (Stl having seats for the shaft ontheir under sides, and pressed downward by a bow-shaped spring 7 theends of which rest on the blocks. The tension of the spring 7 may beadjusted through the hand screw 8, the end of which presses on the bowof the spring. \Vhen the stock is entered between the rolls, asutlicicnt pressure is exerted by the top roll to secure a conengage theteeth. of the ratchet wheel.

tact which will feed the stock along, when the rolls are rotated towardeach other. To impart an equal rotation of the two rolls, we provide theequal gears 9 and 10 mounted on the outer ends of the shafts 4 and Theshaft 4 is driven in one direction only, through a ratchet l1 operatedfrom the shaft 12 through the bevel gears 13 and 14. The bevel gear 13and a spur gear 15 are both fast 011 the shaft 12. Engaging the gear 15is a rack, formed in the rod 16, the upper end of the rod beingconnected'to the crank 0 on the shaft C of the machine. The crank cimparts a reciprocating motion to the rod 16 and through its rack.connection with the gear 15, a back and forth movement is given to theshaft 12. The part. rotation of the shaft 12 is communicatedto the rolls2 and 3 to drive them in one direction only, to feed the stock ashereafter described, and in order to regulate the amount of rotation ofsaid rolls, the connection of the rod 16 with the crank 0 is preferablyadjustable, to vary the throw of the crank. This is effected by mountingthe crank pin 17 on a block 18' arranged to slide in a feather grooveextending longitudinally of the crank. To adjust the block toward orawayfrom the center of the crank, a screw 19' is provided, having one endanchored in a bearing adjacent the center of the crank. By entering asuitablewrench in the hole 20 of the screw, the latter may be turned toslide the block 18 in its groove. The crank pin is locked in itsadjusted position by means well known for the purpose, and therefore nothere described. The. rod 16 slides in a bearing 23 which is swiveled onthe shaft 12. allowing the rod to oscillate during its reciprocation.The backand forth rotation of the gear 1.3 is imparted to the gear 14,the latter being loose on the shaft 4 and, during its rotation in thedirection indicated by the arrows, Figs. 2 and 3, the gear 14 engagesthe shaft 4 through its ratchet connection now described. The hub of thegear 14 extends in a ring-like casing 24 surrounding the ratchet wheel11, see Fig. 3. Adapted to slide in pockets in the casing are a numberofpawls, 25, 25, etc., having teeth on their inner edges adaptedntlo epawls are held in their pockets by the flat pieces 26, 26, fitted toslots in their faces and screwed to the casing, and spiral springs 27 27etc. held in suitable pocketsv in the pawls, and in the casing, pressthe pawls radially inward. hen the, gear 14 rotates in the direction,indicated by the arrow, the pawls engagev the ratchet wheel, and therotation of the shaft 4v imparted through the ratchet, rotates the roll3- and, through, the gears 9 and 10, turns the roll 2- with the sameamount of rotation.

Referring now to Fig. 1. the stock 8, which we have preferred to showflat wire, is brought up from a reel or other supply, over the curvedplate 29, and started through the guide 30 leading between the rolls 2and 3. When introducing a new strip of stock or for adjusting the stockin position, it is sometimes necessary to operate the feed manually, andfor this purpose we provide the ratchet wheel 31 and hand lever 32. Thewheel 31 is titted and keyed to a shouldered portion of the shaft 4, seeFigs. 2 and 4. The handle lever 32 is mounted free to swing on the endof said shaft, held in place by a washer screwed against a secondshoulder on theshaft by the nut 33. Ext-ending through abore in thelever 32 is a plunger 34, see Fig. 4, having at its inner end the head36, formed as abeveled catch. The rim of the wheel 31 is notched and thehead or catch engages the notcheswhen pressed inward by the spring 36,the latter arranged in a pocket 37 in the lever 32. At the opposite endof the plunger is a knurled head 38 having akey 39 which fits the slot40 in the outer-end of the lever. 32. WVhen the key 39 is entered in itsslot, the plunger isfree to be pressed by its spring36 to en: gage theratchet wheel, but by drawing the plunger out un-tilthe key is free fromits slot and then turning it untilthe key rests on the end of the lever,as shown. in Fig. 5, the. catch is helda-way from the ratchet, so thatthe wheel 31 normally rotates free from the lever 32. In other words,when the feed is operating automatically, the lever 32 hangs free andinoperative. From the feed rolls the stock is delivered across a bridgeor support If, under the stripper plate eV and over the face of the diea.

We have preferred to show the punch I) designed simply for cutting offlengths. of the stock, but it willbe obvious that the punch and diemight be adapted to form the stockto any desired'shape or to perforateit, as required, all at the same operation of cutting off. After passingacross the face of the die, the stock, if fed to its proper position,engages the device for controlling the action of the machine clutch E.Means for accomplishing this control electrically in the device at Gwill now be described. This is a contact device arranged to complete anelectric circuit upon the entrance of the stock.

Referring to F ig. 9-, m represents the current generator, 1 the switchwhich, for convenience, is located at the top ofthe machine frame, seeFig. 1, and a z, the magnet coils which actuate an armature, thetripping element of the clutch-control device to be afterward described.One poleof the generator is connected through the switch 1 to the magnetcoils z 2, and the circuit'is continued thence to the terminal 1', whichis here shown as a piece ofspring metal extending shundownward from thegnide-piece of the contactdevice G. The opposite pole of the generatoris connected to the terminal j, which is a flat spring extending upwardfrom the guide 7.1.

The electric circuit is normally open, with the switch 1 closed but asthe stock .9 is fed from the die, it enters between the guides and Z1and contacts with the spring pieces 71 and j, closing the circuit andenergizing the magnet coils z 2, see Fig. 9.

It now being understood that the positioning of the stock in its properrelation to the die closes the circuit, it will next be described howthe magnet .2 controls the clutch mechanism of the machine.

The balance'wheel D, Fig. 1, is rotated continuously by the belt d orother suitable means and is mounted on the shaft C between a flange andthe collar or nut 46 screwed on the end of the shaft, as shown in Fig.7. The wheel D is free to rotate without the shaft, the clutch meansbeing a kc 47 slidable in a keyway extending throng the flange 45. Aflat, ring-like spring 48 fastened at one end to the flange 45 extendspartly around the shaft C, engaging a shoulder on the key 47 with itsfree end, to press the key toward the balance-wheel. A suitable pocket49 is provided in the hub of the lmlaneeqvheel to receive the key 47. Atthe outer end of the key is a lug 50 having a rounded face adapted to beacted upon by a cam face 52 on the lever 51 to throw the key out ofengagement with the balancewheel. The lever 51 is shown more plainly inFig. 6 and the cam-face 52 is illustrated in the plan View Fig. 8. Thelever 51 is pivoted at 53 with its free end held upward by a spring 54:,so that the cam-face 52 lies directly in the path of rotation of the lug50. With the lever in the position shown by full lines, Figs. 6 and 7,upon the rotation of the shaft, the lug 50 engages the cam-face 52 andthe key 47 is withdrawn from its pocket.

In Fig. 11 is shown a modification of the lever 51 inwhich a buffer-stopis provided for the shaft C. In some cases, this is not necessary, thefriction of the cam surface acting on the key 47 against the pressure ofthe spring 48 being snflicient to brake and stop the shaft C after thekey 47 is withdrawn; but where the press is running at a very highspeed, it is considered safer to provide means for positively stoppingthe shaft. After the lu 50 has passed across the camface of the lever 51and the key 47 has been entirely withdrawn from its pocket in thebalance wheel, if the rotation of the shaft O is continued throughmomentum, the lug 50 is brought into contact with the plunger 108. Thelatter is held in a bore in the lug 109 of the lever 51, and the spring110, arranged in a pocket back of thehead of the plunger, serves tobreak the shock of the impulse in stopping the shaft. The shaft C isthus brought to rest without jar, and the balance-wheel then rotatesfree, the machine being inoperative until the lever 51 is drawn downagain to release the key 17 and allow it to reenter its pocket when thelatter is brought around to its proper position.

The reciprocation of the head B of the press, which carries the punchI), is so timed,

\ relative to the operation of the clutch-key 47 f and the cam-face 52,that the key is withdrawn on the upward-stroke of the punch, so that thepunch remains in its uppermost position upon the stopping of the shaft0. It: will be seen that the punch b can only be operated at eachrotation of the balance wheel, when the lever 51. is withdrawn from itsposition of engagement with the clutch key at each rotation. Thewithdrawal of the lever 51 is accomplished by intermittent action on thepart of devices now to be described, whose operation depends on theclosing of the electric circuit by the feeding of the stock, as beforedescribed.

Supported on the frame of the press below the clutch is a casing orframe 55 in which are inclosed the magnet coils .2-.2, and also providedbearings for two reciprocating plungers 56 and 57. These plnngers areheld in suitable guideways in the frame by the gibs 58 and 59 fitted tothe guideways and screwed to the frame. The plunger 56 is reciprocatedupon each rotation of the balance wheel, this being accomplished by acam 60 formed on the hub of the wheel, see dash lines Fig 6. The cam 60engages a roll 6.1 fastened rotatively at the top of the plunger 56 anda spring 62 fastened at one end to the casing engages with its free endthe bottom of the plunger to hold the roll against the cam. The cam 60is shown so formed that the plunger 56 is held in its lowermost positionduring a little more than half the rotation of the balance wheel, butthis is not. essential in all instances, as it is sometimes preferablethat it throw the plunger 56 two or more times during one rotation ofthe balance wheel D.

The plunger 57 is connected at its upper end to the free end of thelever 51 by a link 63. Pivoted on a lug ad jaccnt the lower end of theplunger 57 is a pawl 64: adapted to engage a shoulder 65 in the plungerThe pawl 64 is held away from engagement with the plunger 56 by thelight coiled spring 66. llxtending from the pawl is an arni 67 adaptedto engage a pin 68 held at the extremity of a lever 69. The lever 69 ispivoted at 70 and at its opposite end carries the armature 71 adjacentthe magnet coils 22. When the pawl 64: is out of engagement with theplunger 56, the arm 67 holds the lever 69 with its longer end tiltedupward so that the armature is in a position closely adjacent, but outof contact with the magnet. 'With the pawl 64 out of engagement with theplunger 56, the latter is free to reciprocate alone at each revolutionof the balance-wheel, the plunger 57 remaining stationary in itsuppermost position. The lever 51 is then in engagement with the key 47to hold the latter out of engagement with the balance-wheel, allowingthe shaft C to remain still. lVhen, however, the stock is fed to theproper position to be acted upon by the die, the electric-circuit isclosed by the contact device at G and the magnet is energized. Themagnet attracts the armature 71, moving the lever 69 and, through thearm 67, rocking the pawl 64 to carry the latter into engagement with theplunger 56, when the latter reaches its uppermost position. The shoulder65 then engages the pawl 64 and through said engagement the plunger 57is now carried downward by the plunger The lever 51 is thereby drawnaway from its active position, releasing the key 47 which enters itspocket in the hub of the balance wheel when the latter is in properposition. The shaft C, now connected with the balance wheel, is rotatedto operate the cross-head which carries the punch down through the die,cutting off a length of stock. The length of stock out off is thenejected from the die by the device hereafter described and, as the punchis being with drawn, the stock is fed into position for the nextoperation. The ejection of the finished piece opens the electricalcircuit of the control device a ain, and the magnet coils aredeenergized, releasing the armature '71 and allowing it to fall away ashort distance, the rocking of the lever 69 being limited by the pin112. Before the plunger 56 returns to its uppermost position, the stockis in position to complete the circuit again, providing, of course, thesupply has not been exhausted or the stock held back, by clog ging underthe stripper plate or through other accident. The closing of the circuitenergizes the magnet coils again and raises the armature '71 to rock thelever 69 so that the pawl 64 is not withdrawn from engagement with theplunger 56, but the two pluugcrs remain connected and are bothreciprocated by the cam 60. In this 'ay it will be seen that if thestock is advanced into proper position after each operation of the die,the control device will act at iroper intervals to keep the lever 65)from disengaging the pawl from the plunger 56, and therefore the lever51 will be drawn down at each rotation of the shaft (1. The rotation ofthe cam 60 is so timed, relative to the key L7 that the lever 51 ismoved away before the lug 50 reaches the cam surface, so that acontinuous operation of the punch is maintained, providing the stockfeeds properly. Sometimes, however, there are irregular places in thestock,

as, for instance, where two pieces are joined. together, and it is notdesirable to use these imperfect portions. To prevent their being fedunder the stripper plate, the latter is so formed as to present onlyjust large enough an, opening to admit the proper thickness of stock.Then. an enlarged portion passes through the feed rolls, its movement isarrested at the stripper plate, and upon failure of the stock to reachthe contact device, the machine is stopped, it being understood that thestopping of the machine is effected through failure of the electriccircuit to be closed at the contact device G. hen the magnets are notenergized, the lever 69 remains tilted, with the pin 68 elevated out ofposition to engage the arm 67. Therefore, when the plunger 56 reachesits uppermost position. there is nothing to retainthe pawl 64 inengagement with the shoulder 65, and the spring carries the pawl awayfrom the plunger 56. The plunger 57 is not carried down with the plunger56 at the next reciprocation, but remains with the lever 51 in positionto engage and withdraw the clutch key 47 to arrest the rotation of theshaft C and stop the machine. It is pointed out thatif the stock meetswith resistance at the opening in the stripper plate, and the feed rollscontinue to rotate slightly before the machine is stopped, no damagewill result, because the stock simply bows up from the bridge t to takeup this extra feed.

By employing a properly shaped punch and die, the stock on the die maybe formed in any desired manner at the operation of cutting off thepreceding length, and then at the next operation this formed length iscut off and the succeeding length formed, and so on through thecontinuous operation of the machine.

It will be evident that as each length of stock is cut off it must beremoved from the die to make room for the length of stock to be nextoperated upon. This might be accomplished manually, but to provide forincreased speed and greater production of the machine, we prefer toemploy for this purpose the automatic ejecting device now described.

Supported by a bracket 79 on the frame of the machine, back of the die,is a cylindrical. barrel 75, to the bore of which is fitted the head 76of the plunger 77, see Fig. 10. The ends of the barrel are closed by thescrews 78 and 79, the plunger projecting through a bore in the screw 79.Between the head i 76 of the plunger and the screw 78 is compressed astrong coiled spring 80 and on the opposite side of the head surroundingthe plunger and. bearing on the screw 79 is a much lighter spring 104.On the projecting end of the plunger '77 is secured a crescent shapedstriker 84, normally positioned just back of path of travel of thestock, and

. adapted to cross said path between the die and the contact device Gr,see Fig. 1. The plun er 77 is controlled through the lever l 81 plvotedat 82, the lower arm of which 1 engages a slot in an extension of thehead 76. This extension projects through a slot in the 1 barrel 75, thelength of the slot limiting the throw of the plunger. The lever 81 isheld in the position shown, to retain the plunger l in its rearward'positlon by a trip lever 83 l having an arm 85 engaging the arm 101. gThe lever 83 is pivoted at 102 and the arm 85 is ressed downward by thespring 86, secure to the top of the bracket 2. A second arm 87 contactswith the lug 88 on the bracket 2) to limit the movement of the lever 83.Fastened to the cr0ss-head B of the press is a bracket 9 having a pin 89adapted to engage the arm 87 of the lever 83 when the cross-headdescends. On the outer end of the bracket 9 is a stud or roll 103adapted to engage the arm 101 of the lever 81 when the cross-headreturns.

The action of the ejecting device I is as 1 follows: In Fig. 10, theparts as shown by full lines are represented in normal position. As thecross-head B descends with the punch, the pin 89 approaches the arm 87of j the lever 83, engaging the arm at the finish of the stroke, afterthe stock has been operated upon and the piece cut off. The arm 87 isdepressed, raising the arm 85 and releasing the lever 81. At the releaseof the lever 81, thespring 80 forces the plunger forward into theposition indicated by dotted lines, the striker 84 engaging the edge ofthe piece of severed stock 8 and ejecting it from the die into a roperlyplaced receptacle, not here shown. t will be seen from Figs. 1 and 9that the stripper plate 1) is cut away sufficiently to allow thefinished piece to be thrown out from the die.

The plunger 77 is restored to its normal position by the stud 103 actingon the arm 101. It will be seen that the lower position of the stud asshown by dotted lines at 90, allows the free movement of the arm 101when the lever 81 is released, but as the crosshead B moves upward, thestud 103 engages the arm 101 and carries it back to be latched under thearm 85 of the lever 83. But the I action of the feed of the machine isso rapid j that this means for restoring the plunger -7 7 to itsoriginal position is not quick enough to remove the striker 84 from thepath of the stock before the latter has been moved forward to its newposition. To accomplish aquick return of the plunger from its forwardposition, the recoil spring 104 is dejected forward by the spring 80, itcompresses the lighter spring 104, but as soon as the momentum oftheplunger, due to the projective energy of the spring 80, is spent,

pended upon. When the plunger 77 is pro- I downward at the next stroke.1t carries the the spring 104 reacts upon the plunger quickly returningit to a position such that the striker 84 is out of the path of thestock. The lever 81 then acts as before described to withdraw theplunger to its rearmost position.

While we prefer to operate the machine through the electrical controldevice described, it will be seen from the following that a mechanicalcontrol might be used for the purpose and we have shown such a means inFigs. 12 and 13. The casing 55 is made smaller in this instance, it notbeing required to contain the magnet coils, but otherwise it isessentially the same as before described, and provides bearings for thetwo plungers 56 and 57. While in the previously described device thepawl 64 is shown pivoted to the plunger 57, its effect would be the sameif pivoted to the plunger 56, and in this device we so illustrate it. Inthis modification, the pawl 04 engages a shoulder 91 in the plunger 57,being normally held from such engagement by the spring 92, and to effectthe engagement, a cam face 93 is provided at the lower end of the pawl.The cam face 93 is operated upon by a pin 94 fastened in the lever 95,the latter pivoted at one end to the casing 55, and normally held upwardby a spring 96. Connected to the free end of the lever 95 by a 95 pin 97extending throu "h a slot in the back of the casing 55 is a lin 98 whichin turn is connected to the bell-crank lever 99. The lever 99 has onearm 100 extending upward across the path of the stock, as it feeds from0 the die into the guides g and /c. The operation of this form of deviceis as follows:--

-The plunger 50 is being constantly reciprocated through the cam 00previously described, and with the feed of the machine inoperative,before the supply is started, the pawl (34 hangs inoperative in theposition indicated by dot-and-dash lines, Fig. 12, the lever 95 beingraised to the position also indicated by dot-and-dash lines. As thestock is fed under the stripper plate and thence through the guides gand In, its end contacts with the arm 100 of the lever 99 and rocks thelatter into the position indicated in Fig. 1.3. The movement of thelever 99, through the .link 98, carries the lever 95 downward .into theposition indicated by full lines in Fig. 12, and the pin 94 acting onthe cam face 93 forces the pawl 64 into engagement with the plunger 57.The action of the lever 95 takes place after the plunger 56 has reachedits uppern'iost position, there being sufficient dwell at this point toallow the pawl to be carried into engagement with the shoulder 91. Asthe plunger 56 moves plunger 57 downward, and the lever 51 is drawn downthereby to release the key 47 and allow it to engage the balance wheel Dwhereby the shaft C is rotated to operate the machine, as heretoforedescribed. It will be seen that with each movement of the stock forward,the lever 95 is carired clownward, and if the stock is properly fedafter each stroke of the punch, the pawl 64 will be kept in engagementwith the plunger 57 so that the latter is reciprocated continuously fromthe plunger 56, and the shaft of the press is kept in continuousrotation. When, however, the feed fails, the lever 95 remains in itsuppermost position and the pawl 64 is withdrawn from engagement with theplunger 57? by the spring 92 so that the plunger remains stationary,with the lever 51, Figs. 6 and 7', in position to engage and retain theclutch key 47 out of engagement with the balance wheel.

Upon the automatic stopping of the press, the operator finds thetrouble, remedies it, and starts the stock under the stripper plateagain, feeding it manually by means of the ratchet lever 32. Immediatelythe stock reaches the control device, the machine is startedautomatically, and continues to operate until some further di-flicultyarises. When provided with the electrical control, the machine may bestopped at will, for adjustmentor other purposes, by turning off thecurrentat the switch 3 When the machine stops automatically, it is alsopreferable to turn off the current to guard against an accidentalcontact at G starting the machine before the operator has prepared itfor operation. I

While we have specified certain preferable arrangements of structure andoperation, it will be obvious that the device herein described might bemodified considerably and still come within the scope of this invention.Therefore, we do not limit ourselves to the precise arrangement shown,but

What we claim is:

1. The combination in a press adapted to act on a fed material, and withmeans to feed the material, of driving means to operate the press,devicesto couple and uncouple the driving means and the press, a membercontinuously moved with the driving means, means to connect the movingmember with the coupling devices to couple and actuate the press, and adetector device to cause action of the coupling device when the fedmaterial is in position to be acted upon and cause non-action of saidcoupling device when the fed material is not in position to be actedupon.

2. The combination with a machine having a fed material and means foracting thereon, and including driving means, therefor and devices forcontrolling the action of said driving means, of'a continuously drivenmember operated by the driving devices and a normally still memberadapted to be connected together, and means for-engaging the two membersconstructed to be operated by contact with the fed material.

3. The combination with a press, a continuously rotating wheel, aclutch, a feed device and a material continuously fed there by to thepress, of a normally moving member driven from the wheel, a normallystill member connected with the clutch, engaging means whereby thenormally still member is engaged with the normally moving member to beshifted thereby to operate the clutch, and contact means through whichsaid engagement is effected by contact of the continuously fed material.

4:. The combination with a press, its continuously rotating wheel, itsclutch, its feed devices and a material continuously fed thereby to thepress, of a normally moving member driven from the wheel, a normallystill member connected with the clutch, engaging means whereby thenormally still member is engaged with the normally movingmember,electro-magnetic devices for effecting such engagement, andcontact means operated by the material to efiect the action oftheelectro-magneticdevices and control the action of the press.

5. The combination in a press with the material to be operated upon, ofthe shaft, the continuously rotated balance-wheel on the shaft, a clutchdevice to engage the wheel with the shaft, a lever to operate saidclutch device, a member driven by the balance-wheel, a second memberconnected to operate thelever and adapted to be engaged with thefirstmember, and means controlled by properpositioning of the stock toregulate the engagement of thetwo members.

6; The combination in a press with the stock 8 shaft 0, continuouslyrotated balancewheel D and clutch E for connecting-- the shaft with thebalance-wheel, of a feeding mechanism connected with the shaft C tointermittently feed the stock 8, a cont-rolling means F for operatingthe clutch device and a contact devic-ehaving terminals adapted tobe-operated by the interposition ofthe-stock between theterminals toactuate-the clutch controlling means.

7'. The-combinationin a press witha driv ing shaft C, a punch breciprocated from the shaft, means to rotate the shaft and a clutchdevice for controlling said rotation, of a feeding mechanism H operatedfrom the shaft to feed the-stock after each downward stroke of thepunch, a controlling-means F for the clutch device, and aoontact deviceGfor operating the clutch controlling means, uponthe properfeeding of thestock, having two contact members gand j, between which the stock is fedand dependent for its operation upon the contact'of said stock with boththe two contact members.

8. The combination in a power-press with the material operated upon, ofa punch to sever portions of the material, means actuated by thematerial to control the punch and means spring operated and controlledfrom the movement of the punch to eject the severed portion after eachaction of the punch.

9. An ejector device for presses, comprising a plunger, a spring tooperate the plunger, means to return and retain the plunger against theaction of the spring, and means to release said plunger.

10. The combination with a press and the finished pieces formed by thepress, of an ejector device for said pieces, comprising a plunger, aspring to press the plunger, a second lighter spring compressed by theaction of the first spring and serving to partly return the plunger, andmeans to wholly return the plunger and retain it against the action ofthe first spring.

11. The combination with a movable member B, of a press, of an ejectordevice having a plunger 77, a spring 80 to press the plunger, a lever 81engaging the plunger 77, a lever 83 engaging the lever 81 to retain theplunger, a pin 89 connected with the moving member B and adapted toengage the lever 83 to release the lever 81, and a stud 103 alsoconnected with the member B and adapted to engage the lever 81 to returnthe latter to be engaged by the lever 83.

12. The combination in a press with the material operated upon, of theshaft U, balanee-wheel D rotated on said shaft, and a going member 56operated from the wheel 1), of a key 47 slidable on the shaft, means tobress the key into engagement with the wheel D, a lever 51 normally heldin position to engage the key to withdraw it from the wheel and meansoperated by the material to engage the lever 51 with the going member56.

l2). The combination in a press with the material to be operated upon,driving means and devices for controlling the action of said drivingmeans, of a plunger reciprocated by the driving means, a second plungerconnectcd with the controlling devices, a pawl on one plunger, movableto engage the other

